<?php

$username = $_POST['username'];
$password = $_POST['password'];

if ($username&&$password)
{

$connect = mysql_connect('localhost','root','jason') or die ('Cannot connect');

$query = mysql_query("SELECT * FROM users WHERE username='$username' AND password='$password' LIMIT 1");

mysql_select_db('juser') or die ('Cannot select db');

$numrows = mysql_num_rows($query);

if($numrows!=0)
{

}
else
	die "This username does not exist!";

}
else
	die "Please enter a valid username & password";

?>